Patents by Inventor David Babler

David Babler has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Electronic security system
    Patent number: 5280518
    Abstract: An electronic real estate lockbox system includes a number of operational features, including facsimile reporting capability, bilateral locking solenoids, improved shackle latching capabilities, improved key-compartment release operation, two-wire bilateral lock-key communications, improved case design, viral lockout list propagation, an update code grace period, packet formatted data transmission with error recovery, FSK audio data downloading, and high security challenge-response authorization procedures. A variety of other operational features are also disclosed.
    Type: Grant
    Filed: August 5, 1991
    Date of Patent: January 18, 1994
    Assignee: Supra Products, Inc.
    Inventors: Richard W. Danler, John W. Sherman, David Babler, Ron M. Chapin, John M. Kniffin, Kenneth L. Reviea, Lynn L. Schreiner